like normal rock climbing, buildering takes place in an urban setting on man-made objects such as buildings. usually only practiced by those crazy rock climbers, the point is to spot a very climb-able looking surface and attempt to scale it in sneakers with no other equipment.

"so i was walking around my town today, and the church looked so climbable so i started buildering"

Wife: Honey, are you cheating on me?
Husband: No... Why?
Wife: You're always home so late.
Husband: Argh, I know. They must be putting something into the workahol.
Wife: Crystal was right! You ARE a workaholic.